Import-Module ShowUI very slow in x86 Powershell

There's a similar thread over on the Pscx board, and the problem seems to be unrelated to any particular module, but I'm wondering if anyone here is seeing the same behaviour. On my machine, doing Import-Module ShowUI in an x64 Powershell takes about 2 seconds;
in an x86 Powershell it takes about 40 seconds.